.middle {
    display: flex;
    justify-content: center;
}

.middle > div {
    width: 900px;
    border: 1px solid gray;
    margin: 50px 0;
}

.callus {
    display: flex;
    justify-content: center;
}

.callus > div {
    /*border: 1px solid red;*/
    width: 800px;
}

.callus > div > div:nth-child(1) {
    margin: 50px 0;
}

.callus > div > div:nth-child(1) > div:nth-child(1) {
    display: flex;
    justify-content: center;
    align-items: center;
}

.callus > div > div:nth-child(1) > div:nth-child(2) {
    font-size: 10px;
    /*div居中*/
    /*display: flex;*/
    /*justify-content: center;*/
    /*文字居中*/
    text-align: center;
}

/*后代选择器*/
.callus .zw {
    color: coral;
    font-size: 20px;
}

.callus .yw {
    color: gray;
    font-size: 15px;
}

/*----------------------地图-------------------*/
.callus > div {
    display: flex;
    flex-direction: column-reverse;
}
#container{
    height: 500px;
}